Cannot see it working without at least a number pad. Does not seem to go well with limited arcade controls. A trackball would work if you don't want a mouse hanging around then you would not need a number pad.

credits button - to add creditsright button - slide albums right left button - slide albums leftdown button - to highlight a song when in large album modeenter button - to add highlighted song to queesc button - to return to 4 album viewf1 button to toggle large album mode.

if you disable mouse support the down arrow can select a song when in large single album mode. the enter button selects it and the song is added to the cue.

you can also do without the credits button if you enable free play. also the esc button is not needed because 4 album view returns by itself after some time.